beliefs and practices of the Sumerians and Akkadians, and their successors, the Babylonians and Assyrians, who inhabited ancient Mesopotamia (now in Iraq) in the millennia before the Christian era. These religious beliefs and practices form a single stream of tradition. Sumerian in origin, Mesopotamian religion was added to and subtly modified by the Akkadians (Semites who emigrated into Mesopotamia from the west at the end of the 4th millennium bce), whose own beliefs were in large measure assimilated to, and integrated with, those of their new environment. For historical background, see Mesopotamia, history of. As the only available intellectual framework that could provide a comprehensive understanding of the forces governing existence and also guidance for right conduct in life, religion ineluctably conditioned all aspects of ancient Mesopotamian civilization. It yielded the forms in which that civilization’s social, economic, legal, political, and military institutions were, and...